Meet Brazil's flame-coloured forest monkey
Few animals look as improbable as the golden lion tamarin. Roughly the size of a squirrel but cloaked in glowing reddish-gold fur, this tiny primate lives in just one place on the planet and has become a global emblem of what conservation can achieve. Here are 12 facts that capture why it is so extraordinary. For the full profile, see our golden lion tamarin species guide.
1. It is named for its tiny lion's mane
A ring of long fur frames its dark, bare face, giving it the look of a miniature lion. The scientific name, Leontopithecus rosalia, literally means "lion monkey."
2. It lives in only one forest on Earth
The species is endemic to the lowland Atlantic Forest of Rio de Janeiro state, Brazil, and is found nowhere else in the wild.
3. It weighs less than a can of soup
Adults tip the scales at just 482 to 680 grams, with a body around 20 to 25 cm long and a tail of 26 to 40 cm.
4. Twins are the rule, not the exception
After a gestation of about four and a half months, females almost always give birth to twins, an unusual trait among primates.
5. Dad does most of the carrying
Fathers and older siblings haul the infants around on their backs, handing them back to the mother mainly to nurse.
6. It has claws, not nails
Unlike most monkeys, tamarins have claw-like nails on most digits, letting them cling to vertical trunks like a squirrel.
7. It "talks" with scent
Both sexes scent-mark using glands on the chest, leaving chemical messages that signal territory and breeding status across the dense canopy.
8. It is a tireless omnivore
Its menu spans fruit, flowers, nectar and tree gums alongside insects, spiders, snails, small lizards and bird eggs, probed from bark crevices with long, slender fingers.
9. It nearly vanished
By the 1960s, fewer than 200 survived in the wild as the Atlantic Forest was cleared. Only around 2% of that forest remains today.
10. It is a conservation comeback story
Coordinated breeding, reintroduction and forest restoration lifted wild numbers to roughly 4,800 by the 2022 to 2023 census, earning a 2003 down-listing from Critically Endangered to Endangered.
11. It survived a deadly epidemic
A yellow-fever outbreak that began around 2017 killed roughly a third of the wild population before a vaccine, first administered in 2020, helped turn the tide.
12. It still needs connected forest to survive
Isolated in scattered fragments, the species depends on replanted corridors that let separated family groups meet and breed. WARN's partner-funded work in Brazil supports exactly this kind of habitat restoration; you can learn more on our habitat protection appeal.
Read the full Golden lion tamarin wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
